A truck traveling along a straight road at 20km/h increase its speed to 120km/h in 15s.if its acceleration is constant. Determine the distance traveled.

1 km/hr = 5/18 m/s

a = ((120-20)km/hr)/(15s) = (500/(18*15)) = 50/27 m/s^2
Now, using the usual equation of motion,
s = 50/9 * 15 + 25/27 * 15^2 = 875/3 m